Hyundai Sonata 2024–2026 — service campaign
Bulletin 25-01-075H TSB · NHTSA communication 11024510 · issued Oct 21, 2025
Service campaign
communication type
Electrical System
component
2024–2026
model years
3
vehicle entries
Official summary
Certain Sonata (DN8) vehicles may experience battery drain due to the air conditioning controller not shutting down completely while the vehicle is parked and turned off. This bulletin provides instructions to perform a software update for the ATCU (Air Temperature Control Unit).
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.